#pragma once
// ##########################################################################
// #                                                                        #
// #                              CLOUDCOMPARE                              #
// #                                                                        #
// #  This program is free software; you can redistribute it and/or modify  #
// #  it under the terms of the GNU General Public License as published by  #
// #  the Free Software Foundation; version 2 or later of the License.      #
// #                                                                        #
// #  This program is distributed in the hope that it will be useful,       #
// #  but WITHOUT ANY WARRANTY; without even the implied warranty of        #
// #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the          #
// #  GNU General Public License for more details.                          #
// #                                                                        #
// #          COPYRIGHT: CloudCompare project                               #
// #                                                                        #
// ##########################################################################

#include "CCAppCommon.h"

// Qt
#include <QMenu>
#include <QPair>
#include <QVector>

//! Translation manager
class CCAPPCOMMON_LIB_API ccTranslationManager : public QObject
{
	Q_OBJECT

  public:
	static ccTranslationManager& Get();

	~ccTranslationManager() override = default;

	//! Register a file prefix for translation files.
	/** The files should be named <prefix>_<lang>.ts where <lang> is the 2-letter ISO 639
	    language code in lowercase.
	     e.g. CloudCompare_fr.ts
	    \param prefix	The prefix of the file to register
	    \param path		The path to look for the files in
	**/
	void registerTranslatorFile(const QString& prefix, const QString& path);

	//! Using the translation file prefixes that were registered, load the actual translations
	inline void loadTranslations()
	{
		loadTranslation(languagePref());
	}

	//! Using the translation file prefixes that were registered, load the actual
	//! translation by the 2-letter ISO 639 language code in lowercase.
	void loadTranslation(QString language);

	//! Populate the menu with a list of languages found using files in 'pathToTranslationFiles'
	void populateMenu(QMenu* menu, const QString& pathToTranslationFiles);

  protected:
	explicit ccTranslationManager() = default;

  private: // methods
	struct CCAPPCOMMON_LIB_API TranslatorFile
	{
		QString prefix;
		QString path;
	};
	using TranslatorFileList = QVector<TranslatorFile>;

	using TranslationInfo = QPair<QString, QString>;
	using LanguageList    = QVector<TranslationInfo>;

	QString languagePref() const;

	//! Generate a list of available languages based on the files in the "translation" directory.
	LanguageList availableLanguages(const QString& appName, const QString& pathToTranslationFiles) const;

	void setLanguagePref(const QString& languageCode);

  private: // members
	TranslatorFileList mTranslatorFileInfo;
};
